<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        a {
            display: block;
            width: 200px;
            padding: 4px;

            background-color: #98bf21;
            color: white;
            text-align: center;
            font-weight: bold;
            text-decoration: none;

            border: #7A991A solid 2px;
            border-radius: 50% 50%;
        }

        a:hover, a:active {
            background-color: #7A991A;
        }
    </style>
</head>
<body>
    <a href="https://bilibili.com" target="_blank">这厮一个链接</a>
</body>
</html>